Iron deficiency anemia presents in a variety of ways, including symptoms of anemia and iron deficiency. The main manifestation is tissue and organ hypoxia caused by iron deficiency, and severe iron deficiency anemia can lead to mucosal tissue changes and ectoderm nutritional disorders. Among the symptoms, we can find that in the early stages, the symptoms are relatively concealed and hard to detect. Patients with a slow progression can often adapt well in the early stages and are able to engage in daily work. Common symptoms of anemia include dizziness, headache, fatigue, and tiredness, along with palpitations and shortness of breath after activity, and even symptoms such as blurred vision and tinnitus. For patients with iron deficiency, specific symptoms include angular cheilitis, atrophy of the tongue papillae, glossitis, and severe iron deficiency patients may experience koilonychia, decreased appetite, nausea, and even constipation. Some patients, particularly children during their growth periods, may exhibit delayed growth and behavioral abnormalities, specifically being irritable and easily angered, having difficulty concentrating in class, and declining academic performance. A few patients may also develop pica, which is a special manifestation of iron deficiency anemia. In terms of physical signs, patients may exhibit pallor of the skin and mucous membranes, dry hair, and keratinization of the lips. Nails may be flat, lackluster, and prone to breakage, and a small number of patients may experience mild splenomegaly. These are the clinical manifestations of iron deficiency anemia.